How to handle custom Properties in AutoMapper

Question

I\'ve got a ViewModel that takes some Model data and slightly alters it.

The way I\'m doing it \"works\" since I just pass the DomainModel to the constr

Answer 1

On automapper where you create the Map you can specify additional processes for specific members of the destination type.

So where your default map would be

Mapper.Map();

there is a fluent syntax to define the more complicated mappings:

Mapper.Map()
      .ForMember(vm=>vm.UserName, m=>m.MapFrom(u=>(u.UserName != null) 
                                               ? u.UserName 
                                               : "User" + u.ID.ToString()));

Here the ForMember takes two Arguments the first defines the property that you are mapping to. The second provides a means of defining the mapping. For an example I have copped out and shown one of the easy mappings.

If you require a more difficult mapping, (such as your CurrentUser mapping) you can create a class that implements the IResolver interface, incorporate your mapping logic in that new clases and then add that into the mapping.

Mapper.Map()
  .ForMember(vm=>vm.IsUserMatch, m=>m.ResolveUsing()));

when Mapper comes to do the mapping it will invoke your custom resolver.

Once you discover the syntax of the .ForMember method everything else kind of slots into place.